Solar Thermoelectric Cooler & Warmer is very popular among drivers and outdoor-working men in developed countries such as America, Japan and Europe. It enables you to enjoy cold drink in hot summer and warm food in chilly winter, no matter whether you are on an outing, traveling, long distance driving or even during a traffic jam. This unbelievable dual-purpose technology has been popular in Europe, America and Japan for more than a decade since it was applied to civil use from a technology in aerospace industry of U. S. A, and now is highly regarded by environment professionals. Cooler & Warmer is light enough to be carried either by hand or on the back It cools and warms by means of semi-conductor devices. Featuring dual purpose, long life-time and low power consumption. No compressor and refrigerant. Free of noise and CFC pollution. Simple in construction, small in size, convenient to repair. Fit for use both outdoor and indoor.